This is a report of the statistical analysis, performed in Stata version 5.0, using a data file identical to Leeds99.dta for 

Leeds, Brett Ashley.  1999.  Domestic Political Institutions, Credible Commitments, and International Cooperation.  American Journal of Political Science.

xtgee acopdyad p3dd p3ad mix jwd2 jstable ally3, robust c(ar 1)

note:  observations not equally spaced
       modal spacing is delta year = 1
       7 groups omitted from estimation
note:  some groups have fewer than 2 observations
       not possible to estimate correlations for those groups
       13 groups omitted from estimation


Iteration 1: tolerance = .2030668
Iteration 2: tolerance = .00210947
Iteration 3: tolerance = .00003995
Iteration 4: tolerance = 7.614e-07

General estimating equation for panel data        Number of obs    =     22147
Group and time vars:             dyad year        Number of groups =      1092
Link:                             identity        Obs/group, min   =         2
Family:                           Gaussian                   avg   =     20.28
Correlation:                         AR(1)                   max   =        26
                                                  chi2(6)          =    390.20
Scale parameter:                  56.91124        Prob > chi2      =    0.0000
Pearson chi2(22140):             1260014.9        Deviance         = 1260014.9
Dispersion (Pearson):             56.91124        Dispersion       =  56.91124

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   3.107834   .4083747      7.610   0.000       2.307434    3.908234
    p3ad |   3.062122   .2748283     11.142   0.000       2.523468    3.600775
     mix |   2.180497   .2551332      8.547   0.000       1.680445    2.680549
    jwd2 |   .8897562   .3935864      2.261   0.024        .118341    1.661171
 jstable |   .7278742   .1665238      4.371   0.000       .4014934    1.054255
   ally3 |   4.553181   .3613792     12.599   0.000       3.844891    5.261471
   _cons |   3.522821   .2019832     17.441   0.000       3.126941      3.9187
------------------------------------------------------------------------------

. xtgee acopdyad p3dd jwd2 jstable ally3, robust c(ar 1)

note:  observations not equally spaced
       modal spacing is delta year = 1
       7 groups omitted from estimation
note:  some groups have fewer than 2 observations
       not possible to estimate correlations for those groups
       13 groups omitted from estimation


Iteration 1: tolerance = .18381117
Iteration 2: tolerance = .00193327
Iteration 3: tolerance = .00003307
Iteration 4: tolerance = 5.676e-07

General estimating equation for panel data        Number of obs    =     22147
Group and time vars:             dyad year        Number of groups =      1092
Link:                             identity        Obs/group, min   =         2
Family:                           Gaussian                   avg   =     20.28
Correlation:                         AR(1)                   max   =        26
                                                  chi2(4)          =    225.56
Scale parameter:                  58.75463        Prob > chi2      =    0.0000
Pearson chi2(22142):               1300945        Deviance         =   1300945
Dispersion (Pearson):             58.75463        Dispersion       =  58.75463

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   1.403289   .3936847      3.564   0.000       .6316809    2.174897
    jwd2 |   1.023161   .3941304      2.596   0.009       .2506792    1.795642
 jstable |   1.230449   .1724693      7.134   0.000       .8924153    1.568482
   ally3 |   4.378081   .3780816     11.580   0.000       3.637055    5.119108
   _cons |   4.896814   .1769281     27.677   0.000       4.550041    5.243587
------------------------------------------------------------------------------

. 
. xtgee acopdyad p3ad jwd2 jstable ally3, robust c(ar 1)

note:  observations not equally spaced
       modal spacing is delta year = 1
       7 groups omitted from estimation
note:  some groups have fewer than 2 observations
       not possible to estimate correlations for those groups
       13 groups omitted from estimation


Iteration 1: tolerance = .13555065
Iteration 2: tolerance = .00184673
Iteration 3: tolerance = .00003298
Iteration 4: tolerance = 5.891e-07

General estimating equation for panel data        Number of obs    =     22147
Group and time vars:             dyad year        Number of groups =      1092
Link:                             identity        Obs/group, min   =         2
Family:                           Gaussian                   avg   =     20.28
Correlation:                         AR(1)                   max   =        26
                                                  chi2(4)          =    284.71
Scale parameter:                  58.20449        Prob > chi2      =    0.0000
Pearson chi2(22142):             1288763.8        Deviance         = 1288763.8
Dispersion (Pearson):             58.20449        Dispersion       =  58.20449

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3ad |   1.862567   .2638149      7.060   0.000       1.345499    2.379634
    jwd2 |   1.953733   .4081691      4.787   0.000       1.153736    2.753729
 jstable |   1.223367   .1724239      7.095   0.000       .8854221    1.561312
   ally3 |   4.621313   .3761383     12.286   0.000       3.884096    5.358531
   _cons |   4.513052   .1851834     24.371   0.000       4.150099    4.876005
------------------------------------------------------------------------------

. xtgee acopdyad mix jwd2 jstable ally3, robust c(ar 1)

note:  observations not equally spaced
       modal spacing is delta year = 1
       7 groups omitted from estimation
note:  some groups have fewer than 2 observations
       not possible to estimate correlations for those groups
       13 groups omitted from estimation


Iteration 1: tolerance = .14628525
Iteration 2: tolerance = .00198321
Iteration 3: tolerance = .00003518
Iteration 4: tolerance = 6.265e-07

General estimating equation for panel data        Number of obs    =     22147
Group and time vars:             dyad year        Number of groups =      1092
Link:                             identity        Obs/group, min   =         2
Family:                           Gaussian                   avg   =     20.28
Correlation:                         AR(1)                   max   =        26
                                                  chi2(4)          =    238.08
Scale parameter:                  58.86581        Prob > chi2      =    0.0000
Pearson chi2(22142):             1303406.7        Deviance         = 1303406.7
Dispersion (Pearson):             58.86581        Dispersion       =  58.86581

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
     mix |   .5835918   .2450075      2.382   0.017        .103386    1.063798
    jwd2 |    1.59362   .4108859      3.878   0.000       .7882985    2.398942
 jstable |   1.224336   .1773244      6.904   0.000       .8767866    1.571886
   ally3 |   4.679423   .3827245     12.227   0.000       3.929297     5.42955
   _cons |   4.782466   .1889477     25.311   0.000       4.412135    5.152797
------------------------------------------------------------------------------

. 
. xtgee acopdum p3dd p3ad mix jwd2 jstable ally3, robust f(bin) l(logit)

Iteration 1: tolerance = .41549345
Iteration 2: tolerance = .0337322
Iteration 3: tolerance = .000377
Iteration 4: tolerance = .00001459
Iteration 5: tolerance = 6.787e-07

General estimating equation for panel data        Number of obs    =     22320
Group variable:                       dyad        Number of groups =      1112
Link:                                logit        Obs/group, min   =         1
Family:                           binomial                   avg   =     20.07
Correlation:                  exchangeable                   max   =        26
                                                  chi2(6)          =    152.99
Scale parameter:                         1        Prob > chi2      =    0.0000
Pearson chi2(22313):              21216.07        Deviance         =  29073.69
Dispersion (Pearson):             .9508388        Dispersion       =  1.302993

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
 acopdum |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   .6057453     .10123      5.984   0.000       .4073381    .8041524
    p3ad |   .4104447   .0766617      5.354   0.000       .2601904    .5606989
     mix |   .3111988   .0586027      5.310   0.000       .1963395     .426058
    jwd2 |   .2248631    .098146      2.291   0.022       .0325005    .4172256
 jstable |   .1870909    .033596      5.569   0.000        .121244    .2529378
   ally3 |   .5415788   .0822559      6.584   0.000       .3803602    .7027973
   _cons |  -.4549915   .0588589     -7.730   0.000      -.5703528   -.3396302
------------------------------------------------------------------------------

. 
. xtgee acopdum p3dd jwd2 jstable ally3, robust f(bin) l(logit)

Iteration 1: tolerance = .40807419
Iteration 2: tolerance = .02893198
Iteration 3: tolerance = .00382599
Iteration 4: tolerance = .00045846
Iteration 5: tolerance = .00005566
Iteration 6: tolerance = 6.785e-06
Iteration 7: tolerance = 8.280e-07

General estimating equation for panel data        Number of obs    =     22320
Group variable:                       dyad        Number of groups =      1112
Link:                                logit        Obs/group, min   =         1
Family:                           binomial                   avg   =     20.07
Correlation:                  exchangeable                   max   =        26
                                                  chi2(4)          =    114.99
Scale parameter:                         1        Prob > chi2      =    0.0000
Pearson chi2(22315):              21677.18        Deviance         =  29667.52
Dispersion (Pearson):             .9714173        Dispersion       =  1.329488

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
 acopdum |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   .4070893   .0957979      4.249   0.000       .2193289    .5948497
    jwd2 |   .2148667   .0982424      2.187   0.029       .0223151    .4074182
 jstable |   .2233327   .0340148      6.566   0.000       .1566649    .2900006
   ally3 |   .5222454   .0822838      6.347   0.000       .3609721    .6835186
   _cons |  -.2458165   .0484972     -5.069   0.000      -.3408691   -.1507638
------------------------------------------------------------------------------

. 
. 
. xtgee acopdum p3ad jwd2 jstable ally3, robust f(bin) l(logit)

Iteration 1: tolerance = .37392756
Iteration 2: tolerance = .01822113
Iteration 3: tolerance = .00265321
Iteration 4: tolerance = .00038275
Iteration 5: tolerance = .00005616
Iteration 6: tolerance = 8.272e-06
Iteration 7: tolerance = 1.219e-06
Iteration 8: tolerance = 1.798e-07

General estimating equation for panel data        Number of obs    =     22320
Group variable:                       dyad        Number of groups =      1112
Link:                                logit        Obs/group, min   =         1
Family:                           binomial                   avg   =     20.07
Correlation:                  exchangeable                   max   =        26
                                                  chi2(4)          =    112.99
Scale parameter:                         1        Prob > chi2      =    0.0000
Pearson chi2(22315):              21244.13        Deviance         =  29410.30
Dispersion (Pearson):             .9520111        Dispersion       =  1.317961

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
 acopdum |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3ad |   .3006919   .0742893      4.048   0.000       .1550875    .4462964
    jwd2 |   .2885932   .0958187      3.012   0.003       .1007921    .4763943
 jstable |   .2156546   .0337332      6.393   0.000       .1495387    .2817705
   ally3 |   .5591328   .0819285      6.825   0.000       .3985558    .7197098
   _cons |  -.2699603    .050659     -5.329   0.000        -.36925   -.1706705
------------------------------------------------------------------------------

. 
. xtgee acopdum mix jwd2 jstable ally3, robust f(bin) l(logit)

Iteration 1: tolerance = .37430707
Iteration 2: tolerance = .02648619
Iteration 3: tolerance = .0042571
Iteration 4: tolerance = .00062934
Iteration 5: tolerance = .00009395
Iteration 6: tolerance = .00001404
Iteration 7: tolerance = 2.100e-06
Iteration 8: tolerance = 3.141e-07

General estimating equation for panel data        Number of obs    =     22320
Group variable:                       dyad        Number of groups =      1112
Link:                                logit        Obs/group, min   =         1
Family:                           binomial                   avg   =     20.07
Correlation:                  exchangeable                   max   =        26
                                                  chi2(4)          =    103.97
Scale parameter:                         1        Prob > chi2      =    0.0000
Pearson chi2(22315):              21384.39        Deviance         =  29585.15
Dispersion (Pearson):             .9582968        Dispersion       =  1.325796

                             (standard errors adjusted for clustering on dyad)
------------------------------------------------------------------------------
         |               Robust
 acopdum |      Coef.   Std. Err.       z     P>|z|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
     mix |   .1037543   .0561396      1.848   0.065      -.0062773    .2137859
    jwd2 |   .2643143   .0955978      2.765   0.006        .076946    .4516827
 jstable |   .2231451   .0338485      6.592   0.000       .1568032     .289487
   ally3 |   .5624499    .081392      6.910   0.000       .4029246    .7219753
   _cons |  -.2327702   .0511191     -4.553   0.000      -.3329617   -.1325786
------------------------------------------------------------------------------

. 
. 
. drop if acopdum==0
(10505 observations deleted)

. regress acopdyad p3dd p3ad mix jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   11815
                                                       F(  6, 11808) =   71.33
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0423
                                                       Root MSE      =  6.7561

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   2.846949   .2374155     11.991   0.000       2.381576    3.312322
    p3ad |   1.335054   .1663383      8.026   0.000       1.009003    1.661104
     mix |   .5630896    .174427      3.228   0.001       .2211841    .9049952
    jwd2 |   .6155998   .1916395      3.212   0.001       .2399548    .9912448
 jstable |   .2710611    .129799      2.088   0.037       .0166336    .5254886
   ally3 |   1.541195   .1590452      9.690   0.000        1.22944     1.85295
   _cons |   10.84744   .1365295     79.451   0.000       10.57982    11.11506
------------------------------------------------------------------------------

. regress acopdyad p3dd jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   11815
                                                       F(  4, 11810) =   91.50
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0379
                                                       Root MSE      =   6.771

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   2.195288   .2070106     10.605   0.000       1.789514    2.601063
    jwd2 |   .5685918   .1870761      3.039   0.002       .2018918    .9352918
 jstable |   .3945493    .126342      3.123   0.002        .146898    .6422005
   ally3 |    1.45942   .1557554      9.370   0.000       1.154113    1.764726
   _cons |   11.47044   .0931766    123.104   0.000        11.2878    11.65308
------------------------------------------------------------------------------

. regress acopdyad p3ad jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   11815
                                                       F(  4, 11810) =   80.06
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0285
                                                       Root MSE      =  6.8043

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3ad |   .6058129   .1331246      4.551   0.000       .3448667    .8667592
    jwd2 |   1.620184   .1897984      8.536   0.000       1.248148     1.99222
 jstable |   .5358454   .1264872      4.236   0.000       .2879096    .7837811
   ally3 |   1.813892   .1540918     11.771   0.000       1.511846    2.115937
   _cons |   11.33695    .104066    108.940   0.000       11.13296    11.54094
------------------------------------------------------------------------------

. regress acopdyad mix jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   11815
                                                       F(  4, 11810) =   78.82
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0297
                                                       Root MSE      =    6.80

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
     mix |   -.762135   .1358384     -5.611   0.000      -1.028401   -.4958695
    jwd2 |   1.470285    .185397      7.930   0.000       1.106876    1.833694
 jstable |   .6224073    .127833      4.869   0.000       .3718335     .872981
   ally3 |   1.625527   .1586912     10.243   0.000       1.314466    1.936588
   _cons |   11.78657   .1011876    116.482   0.000       11.58822    11.98491
------------------------------------------------------------------------------

use "D:\research\DomInstC\AJPS\aljan.dta", clear

. tobit acopdyad p3dd p3ad mix jwd2 jstable ally3, ll(0)

Tobit Estimates                                         Number of obs =  22320
                                                        chi2(6)       =2986.01
                                                        Prob > chi2   = 0.0000
Log Likelihood = -53856.025                             Pseudo R2     = 0.0270

------------------------------------------------------------------------------
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |    6.77847   .3468629     19.542   0.000       6.098595    7.458346
    p3ad |    7.86887   .2665907     29.517   0.000       7.346334    8.391407
     mix |   6.207332   .2542512     24.414   0.000       5.708982    6.705682
    jwd2 |   .7371229   .2883475      2.556   0.011       .1719416    1.302304
 jstable |   1.506126   .2011456      7.488   0.000       1.111866    1.900385
   ally3 |   9.034571   .2554487     35.367   0.000       8.533874    9.535268
   _cons |  -5.018513   .1987946    -25.245   0.000      -5.408164   -4.628861
---------+--------------------------------------------------------------------
     _se |   12.44906   .0901841              (Ancillary parameter)
------------------------------------------------------------------------------

Obs. summary:     10505 left-censored observations at acopdyad<=0
                  11815 uncensored observations

generate anoc=1.

. recode anoc 1=0 if p3dd==1
(3267 changes made)

. recode anoc 1=0 if p3ad==1
(4911 changes made)

. recode anoc 1=0 if mix==1
(7095 changes made)

. tabulate anoc

       anoc |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      15273       68.43       68.43
          1 |       7047       31.57      100.00
------------+-----------------------------------
      Total |      22320      100.00


. drop if anoc==1
(7047 observations deleted)

. regress acopdyad mix jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   15273
                                                       F(  4, 15268) =  221.49
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0621
                                                       Root MSE      =  8.0891

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
     mix |   -1.05544   .1318324     -8.006   0.000      -1.313847   -.7970323
    jwd2 |   .6798565   .1799528      3.778   0.000       .3271274    1.032586
 jstable |   .1525257   .1340985      1.137   0.255      -.1103233    .4153747
   ally3 |   4.871543   .1989488     24.486   0.000        4.48158    5.261506
   _cons |   7.287194   .1208348     60.307   0.000       7.050343    7.524044
------------------------------------------------------------------------------

. regress acopdyad p3dd jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   15273
                                                       F(  4, 15268) =  206.00
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0594
                                                       Root MSE      =  8.1007

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |    .800781    .195986      4.086   0.000        .416625    1.184937
    jwd2 |   .4563029   .1853307      2.462   0.014       .0930327    .8195731
 jstable |   .0742501   .1336906      0.555   0.579      -.1877994    .3362997
   ally3 |   4.934723   .2002028     24.649   0.000       4.542302    5.327145
   _cons |   6.712867   .1042848     64.371   0.000       6.508457    6.917278
------------------------------------------------------------------------------

. regress acopdyad p3ad jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   15273
                                                       F(  4, 15268) =  218.39
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0600
                                                       Root MSE      =  8.0981

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3ad |   .7795325   .1395419      5.586   0.000       .5060137    1.053051
    jwd2 |   1.030049   .1871894      5.503   0.000       .6631352    1.396962
 jstable |   .1762065   .1344518      1.311   0.190       -.087335     .439748
   ally3 |   5.105783   .1952227     26.154   0.000       4.723123    5.488443
   _cons |    6.41519    .121435     52.828   0.000       6.177163    6.653217
------------------------------------------------------------------------------

. regress acopdyad p3dd p3ad jwd2 jstable ally3, robust

Regression with robust standard errors                 Number of obs =   15273
                                                       F(  5, 15267) =  178.26
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0621
                                                       Root MSE      =  8.0893

------------------------------------------------------------------------------
         |               Robust
acopdyad |      Coef.   Std. Err.       t     P>|t|       [95% Conf. Interval]
---------+--------------------------------------------------------------------
    p3dd |   1.137484   .2029703      5.604   0.000       .7396377     1.53533
    p3ad |   1.012908   .1446637      7.002   0.000       .7293496    1.296466
    jwd2 |   .6327038   .1880227      3.365   0.001       .2641568    1.001251
 jstable |   .1452508   .1341789      1.083   0.279      -.1177558    .4082574
   ally3 |   4.853766   .2011711     24.128   0.000       4.459446    5.248085
   _cons |   6.245759   .1254729     49.778   0.000       5.999817    6.491701
------------------------------------------------------------------------------

. exit, clear
